三江平原湿地生态系统P、K分布特征及季节动态研究

对三江平原毛果苔草，狭叶甜茅（Carex lasixarpa-Glyeria spiculosa)湿地和小叶章（Deyeuxia angusti,folia)湿地的值物，土壤和地表积水进行P，K含量测定,运用一元非线性回归分析对P，K元素含量季节动态特征进行了探讨，结果表明，不同种类的湿地植物，同种植物的不同器官其P，K含量存在的差异，但部特点是K含量高于P含量，说明湿地植物具有富集K的特性，两类湿地土壤P，K全量，速效果的剖面分布特征也不同，名层土壤全K含量均高于全P含量，植物，土壤和地表积水中P，K含量均有明的季节动态变化，一元非线性回归模拟均得到较理想的模拟模型，相关系数大多在0．9以上，F检验较显著。

Distribution characteristics and seasonal dynamics of phosphorus and potassium in wetland ecosystem in the Sanjiang Plain.

From May to October in 1997, the plant,soil and logging water in the wetlands were sampled monthly,and their P and K concentrations were measured.With the method of one-factor non-linear regression analysis,the seasonal dynamics of P and K in two types of wetland i.e.,in Carex lasiocarpa-Glyceria spiculosa wetland and in Deyeuxia angustifolia wetland were studied.The concentrations of P and K varied with different species of wetland plant and different organs of the same plant species.But their common property was that the concentration of K was higher than that of P,which shows that the mire-wetland plants had the property of enriching K element.The concentrations of P and K had an obvious seasonal dynamics in plant,soil and logging water,but the patterns were not the same.Some simulation models were obtained,which could be used to forecast the seasonal dynamics of P and K contents.